Fluid sprinkling – spraying – and diffusing – Processes – Including centrifugal force or spattering
Patent
1982-10-27
1986-01-07
Nase, Jeffrey V.
Fluid sprinkling, spraying, and diffusing
Processes
Including centrifugal force or spattering
239224, B05B 310
Patent
active
045629587
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for spraying a liquid or suspension by means of centrifuging a spray cone of small droplets from a rotating centrifugal disc, as well as a corresponding spray device with a drive shaft which is activated into a rapid rotation by means of a drive device, at least one centrifugal disc mounted on the drive shaft for operating a spray cone of small droplets, as well as feeding devices for applying of the liquid to be sprayed onto the centrifugal disc.
In known methods and test devices of this type, the direction of the spray cone is influenced by the diameter of the centrifugal disc and its number of rotation. For obtaining a sufficiently fine and uniform droplet size, it is required to drive the centrifugal disc at a very high number of rotations of, for example, 10,000 RPM. Thereby, one can achieve a very uniform droplet size of, for example, 35 u, however the hollow cone which is generated during spraying has a relative large diameter of, for example, 100 to 120 cm which is undesirable for many application purposes.
It is therefore an object of the invention to provide a method for spraying of a liquid or suspension, a corresponding spraying device or a suitable centrifugal disc which obtains in a simple manner the generation of a spray cone of a reduced diameter without impairing the uniformness and fineness of the generated droplet size.
To solve this object of the invention, the aforementioned method is characterized in accordance with the invention by a device and a method in which means and steps are provided for supplying a liquid or a suspension to a centrifugal disc rotatable about an axis of rotation and having an outer annular skirt so that the liquid flows toward and along said outer annular skirt and then off the latter so as to generate a spray cone of small droplets, and for generating during rotation of said centrifugal disc a gas stream directed from inside said spray cone in an axial direction toward said centrifugal disc so as to form a centripetal gas flow extending in a direction transverse to said axial directions and reducing the diameter of said spray cone.
The inventive method and the inventive spray devices enable in a simply, inexpensive manner to substantially reduce the diameter of the generated spray cone with respect to known devices, without impairing the fineness and uniformity of the droplet size.
For example, with a centrifugal disc which has an outside diameter of 5 cm, a spray cone with a diameter of only 25 to 35 cm can be generated, without impairing the fineness and the uniformity of the droplet size. The advantages of the inventive device are particularly accentuated when spraying relative concentrated liquids or suspensions, wherein non-uniformity in the droplet size are particularly disadvantageous on the sprayed articles, due to the non-uniform distribution of the spray good.
The inventive method and the inventive spray devices are particularly suitable when faces of a relative small dimension should be treated, without an undesirable spraying of adjacent areas. For example, this is the case when spraying goods which are mounted on a relative small conveyor belt, whereby the diameter of the spray cone should not exceed the width of the conveyor belt.
In the following, preferred embodiments of the inventive spray device are further explained in conjunction with the appended drawings.
The drawings show:
FIG. 1 a schematic cross section through a spray device and
FIG. 2 a schematic cross section through a modified spray device.
The spray device shown in FIG. 1 is provided with a battery operated drive motor 1 on the drive shaft 2 of which a centrifugal disc 3 is detachably mounted. The centrifugal disc 3 is provided with a substantially radially extending disc segment 4 and at its outer edge obliquely bevelled edge plate 5 whose outer spray edge 6 is shaped in a known manner with fine saw tooth serrations (serration width about 0.5 mm), which is not shown in the drawings for purposes of clarity. A propeller 10 is disposed in the inner
REFERENCES:
patent: 1973051 (1934-09-01), Doolittle
patent: 3086712 (1963-04-01), Frazier
Jones Mary Beth O.
Mantis ULV-Spruehgeraete GmbH
Nase Jeffrey V.
Striker Michael J.
LandOfFree
Method and device for spraying a liquid or a suspension does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for spraying a liquid or a suspension, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for spraying a liquid or a suspension will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-108032